Carbon holder



M. C. STERN vMaly 31, 1938.

CARBON HOLDER Filed Jan. 7, 1936 Patented May 31, 1938 UNITED STATES orFleE CARBON HOLDER poration of Ohio Application January 7, 1936, Serial No. 57,957

4 Claims.

This invention relates to carbon sheet holders for use with typewriting and billing machines, and other machines for making multiple copies of documents. v

One object of this invention is to provide a carbon sheet holder, the parts of which are of a permanent nature and capable of repeated use.

Another object is to provide a carbon holder, the parts of which are quickly detachable one from another so that a used carbon sheet may be instantly replaced with a new one and the holder immediately put back into use.

Another object is to provide such a carbon sheet holder wherein the change from a worn sheet to a new sheet may be made without the use of any special tools, and merely with the iingers of the operator. Y

Another object is to provide a carbon sheet holder having parts cooperating with perforations in the carbon sheet so that any slippage of the carbon sheet is absolutely prevented.

Another object is to provide a carbon sheet holder having parts which are capable of making perforations in an ordinary carbon sheet so that any available carbon sheet may be used in an emergency when the perforated carbon sheets are not available.

Another object is to` provide a carbon sheet for use with a carbon sheet holder, this carbon sheet having perforations and a folding indication so that the sheet may be vinstantly aligned with the holder and placed thereon without danger of slippage or of being mounted obliquely.

In the drawing:

Figure 1 is a front elevation of the carbon sheet holder of this invention, showing a carbon sheet attached thereto.

Figure 2 is a perspective View of the supporting bar.

Figure 3 is a perspective View of the holding clamp.

Figure 4 is an enlarged cross sectional view along the line lof Figure 1.

Figure 5 is a longitudinal section along the line 5-5 of Figure 4..

Figure 6 is a'perspective View of a carbon sheet employed with the carbon sheet holder of this invention, showing the sheet in its straight o and folded positions.

Figure '7 is an enlarged perspective View of the carbon sheet holder with a portion of a carbon sheet secured thereto. Y

Referring to the drawing in detail, Figure 1 shows the device of this invention as consisting of a supporting bar, generally designated l upon which is arranged a carbon sheet, generally designated E, secured thereto by a holding clamp, generally designated 3. The supporting bar l (Figure 2) consists of an elongated strip of material, such as metal, synthetic resin or ber having holes 4 at the opposite ends thereof. At intermediate points between the ends of the supporting bar are projections 5, which extend above the edges of the bar. These projections are placed on the opposite edges of the supporting bar l for convenience in use, although but a single set of these projections is in use at a given time.

The holding clamp 3 (Figure 3) consists of a member of approximately U-shaped cross section having a back Ei, front portions 'l and a top portion 3 interconnecting the front and back portions 6 and l. The top portion 8 is provided with a pair of cutaway portions 9 for the purpose of receiving the projections 5 upon the supporting bar l. The cutaway portions 9 are therefore arranged at the same spacing as the projections 5. The holding clamp 3 is preferably made of material of a resilient nature so that the front portions 'l exert a spring-like effect.

The carbon sheet employed with the carbon sheet holder of Figures 2 and 3 may be employed with carbon paper of any suitable kind (Figure 6). At the top of the carbon sheet 2 are arranged spaced slcts or perforations l0, having a spacing equal to the spacing of the projections 5 of a suicient size to receive these projections. Also preferably supplied in cooperation with the perforations l!) is a folding indication Il, consisting of a mark or indentation upon the carbon sheet 2 so as to enable the operator to fold the carbon sheet accurately and in line with the perforations l0. In this manner the carbon sheet is maintained in perfect alignment, and without danger of its being assembled obliquely.

In operation the carbon sheet 2 is folded along the folding indication il and the supporting bar l placed within the fold, with its projections 5 extending through the perforations I0. The holding clamp 3 is then grasped by the operator and slipped down over the assembly of the carbon sheet and supporting bar, with its cutaway portions 9 in line with the projections 5 extending' through the perforations lll. The holding clamp 3 is pressed firmly down until it comes to rest with the perforations 5 within the cutaway portions 9. The result is shown in Figure 7.

The carbon sheet holder and carbon sheet of this invention may be employed in any of the typewriting, manifolding, multigraphing or other machines for making multiple copies of records or documents. To this end the holes 4 are supplied at the ends of the holder, these holes being placed upon suitable pins in the carbon sheet carrier of the machine. In use a plurality of carbon sheet holders interleaved with sheets of paper is placed in the machine. The sheets of paper may be in the form of strips, folded packs or rolls, according to the manner well known to those skilled in the art.

It is desired to comprehend within this invention such modications as may be embraced within the claims and the scope of the invention.

Having thus fully described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. In a carbon sheet holder, a support for a perforated and folded carbon sheet, said support engaging the carbon sheet within the fold, a plurality of spaced projections on the support to engage perforations in the carbon sheet, and a spring clamp having opposing sides adapted to urge said carbon sheet into engagement with said support and to hold said projections in said perforations to secure the carbon sheet to the support, one side of said clamp being cut away intermediate said projections to provide a pair of ngers respectively corresponding to said projections and adjacent thereto whereby to concentrate the spring of said clamp adjacent said projections.

2. In a carbon sheet holder, a support for a perforated and folded carbon sheet, said support engaging the carbon sheet within the fold, a plurality of spaced projections on the support to engage perforations in the carbon sheet, and a spring clamp to secure the carbon sheet to the support, said spring clamp having opposing portions engaging said carbon sheet on opposite sides of said support to hold the perforations of said carbon sheet in engagement with the projections of said support, one side of said clamp being cut away intermediate said projections to provide a pair of fingers respectively corresponding to said projections and adjacent thereto vcarbon sheet, one of said opposing portions including fingers disposed near said projections and adapted to apply the urge of said spring clamp adjacent said projections and perforations.

4. A clamp for a carbon sheet holder comprising a spring member of approximate U-shape cross section having opposing sides and a pair of apertures, one of said sides being cut away intermediate said apertures to provide a pair of fingers respectively corresponding to said apertures and adjacent thereto whereby to concentrate the spring of said clamp adjacent said apertures.

MILTON C. STERN. 

